What is a decent amount of Bitcoin you should have to make day trading worth while?
Since it is obvious that you are just a newbie in the field of Trading, it would be better if you play it out first with an amount that you can afford to lose. Like for example, 0.05
BTC is not that bad for starting day trading. You have enough to cover up the fees and you get a good chance to experience day trading first hand and when you feel like you learn the know-hows then add more to your initial amount for trading.
Good advise since there's a lots of things that needed to understand first before dealing with trading better to use the money that you can afford to lose and easily forget just in case it will turned your investment in a not good situation, a lots of traders inside exchange already have a lots of knowledge and with a glimpse of an eye the price fluctuates really deep or really high so understanding that and knowing how well you can survive should be taking place.